LP3913 Datasheet, PDF (26/70 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players

LP3913
SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013
Figure 54. Voltage Threshold Levels
Vterm
4.2V (Typ.)
Active
VBLA
2.4-3.5V (factory
programmable)
Vuvlo
2.4V (Typ.)
2.1V
Vpor
0.9V
Battery safety switch on/off threshold
Standby
PowerOff
www.ti.com
LDO1,2
BUCK1,2
BUCK3
CHARGER
Power Off
Off
Off
Off
Off
A/D Converter
NRST
I²C interface
Internal System Oscillator
Battery Monitor
Current consumption
Off
Low
Off
Off
Off
<1 µA
Table 2. Power State Table
Standby
Off
Off
Off
Off
Off
Low
Off
Off
On
10 µA (typ)
Active
On
On
On
On if Charger / USB
Present
On
High
On
On
On
See Electrical
Characteristics
Charger Standby
Off
Off
Off
On if Charger / USB
Present
Off
Low
On
On
On
See Electrical
Characteristics
Power-On-Reset
The LP3913 is equipped with an internal Power-On-Reset (“POR”) circuit that will reset the logic when V_DD <
V_POR. This ensures that the logic is properly initialized when V_DD rises above the minimum operating voltage of
the Logic and the internal oscillator that clocks the Sequential Logic in the Control section.
Thermal Shutdown and Thermal Alarm
An internal temperature sensor monitors the junction temperature of the LP3913 and forcibly invokes standby
mode in the unusual case when the junction temperature of the silicon exceeds the normal operating level due to
excessive loads on all power regulators and the Li-ion charger and/or due to an abnormally high ambient
temperature. The thermal Shutdown threshold is 160°C.
The thermal shutdown is preceded by a Thermal alarm that generates an interrupt request if unmasked (see
Interrupt Request generation). The temperature threshold for triggering the alarm is 115°C.
NRST Pin
The NRST pin is an open-drain output and is active low during Standby, Power Off and Charger Standby modes.
The NRST timing is determined by a factory programmable counter.
Control Registers
The LP3913 contains 14 user programmable registers that configure the functionality of the individual modules
inside the IC. Registers are programmed through an I²C interface and have default values that are invoked
during an internal reset. Some of the default values can be tailored to the specific needs of the system designer
(see APPLICATIONS INFORMATION).
26
Submit Documentation Feedback
Product Folder Links: LP3913
Copyright © 2006–2013, Texas Instruments Incorporated